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The tomato (Solanum lycopersicum, formerly Lycopersicon lycopersicum) is a plant in the Solanaceae or nightshade family, native to Central, South, and southern North America from Mexico to Peru. It is a short-lived perennial plant, grown as an annual plant, typically growing to 1–3 m in height, with a weak, woody stem that usually scrambles over other plants. The genus Solanum also contains the eggplant and the potato, as well as many poisonous species. The leaves are 10–25 cm long, pinnate, with 5–9 leaflets, each leaflet up to 8 cm long, with a serrated margin; both the stem and leaves are densely glandular-hairy. The flowers are 1–2 cm across, yellow, with five pointed lobes on the corolla; they are borne in a cyme of 3–12 together. The fruit is an edible, brightly colored (usually red, from the pigment lycopene) berry, 1–2 cm diameter in wild plants, commonly much larger in cultivated forms. The word tomato derives from a word in the Nahuatl language, tomatl. The specific name, lycopersicum, means "wolf-peach" (compare the related species S. lycocarpum, whose scientific name means "wolf-fruit", common name "wolf-apple").
Early history According to Andrew F. Smith's The Tomato in America, the tomato probably originated in the highlands of the west coast of South America. Smith notes there is no evidence the tomato was cultivated or even eaten before the Spanish arrived. Other researchers, however, have pointed out that this is not conclusive, as many other fruits in continuous cultivation in Peru are not present in the very limited historical record. Much horticultural knowledge was lost after the arrival of Europeans. In any case, by some means the tomato migrated to Central America. Maya and other peoples in the region used the fruit in their cooking, and it was being cultivated in southern Mexico and probably other areas, by the 16th century. It is thought that the Pueblo people believed those who witnessed the ingestion of tomato seeds were blessed with powers of divination. The large, lumpy tomato, a mutation from a smoother, smaller fruit, originated and was encouraged in Central America. Smith states this variant is the direct ancestor of some modern cultivated tomatoes. Spanish distribution After the Spanish conquest of South America, the Spanish distributed the tomato throughout their colonies in the Caribbean. They also brought it to the Philippines, from which point it moved to southeast Asia and then the entire Asian continent. The Spanish also brought the tomato to Europe. It grew easily in Mediterranean climates, and cultivation began in the 1540s. It was probably eaten shortly after it was introduced, though it was certainly being used as food by the early 1600s in Spain. The earliest discovered cookbook with tomato recipes was published in Naples in 1692, though the author had apparently obtained these recipes from Spanish sources. Tomatoes in Italy Because the plant was clearly similar to its nightshade congeners, it was assumed for years to be poisonous in Italy, where it was grown as a decorative plant. Eventually, the peasant classes discovered that it could be eaten when more desirable food was scarce. This eventually developed into a whole cuisine of tomato dishes, as the wonders of the fruit became obvious. This development took several hundred years, with wide acceptance not happening until the 18th century. Tomatoes in Britain The tomato plant was not grown in England until the 1590s, according to Smith. One of the earliest cultivators was John Gerard, a barber-surgeon. Gerard's Herbal, published in 1597 and largely plagiarized from continental sources, is also one of the earliest discussions of the tomato in England. Gerard knew that the tomato was eaten in both Spain and Italy. Nonetheless, he believed that it was poisonous (tomato leaves and stems contain poisonous glycoalkaloids, but the fruit is safe). Gerard's views were influential, and the tomato was considered unfit for eating (though not necessarily poisonous) for many years in Britain and its North American colonies. By the mid-1700s, however, tomatoes were widely eaten in Britain; and before the end of that century, the Encyclopædia Britannica stated that the tomato was "in daily use" in soups, broths, and as a garnish. Tomatoes were originally known as "Love Apples", possibly based on a mistranslation of the Italian name pomo d'oro (golden apple) as pomo d'amore. North America The earliest reference to tomatoes in British North America is from 1710, when herbalist William Salmon reported seeing them in what is today South Carolina. They may have been introduced from the Caribbean. By the mid-18th century, they were cultivated on some Carolina plantations, and probably in other parts of the South as well. It is possible that some people continued to think tomatoes were poisonous at this time; and in general, they were grown more as ornamental plants than as food. Cultured people like Thomas Jefferson, who ate tomatoes in Paris and sent some seeds home, knew the tomato was edible, but many of the less well-educated did not. However, this changed in the early 19th century, first in the Southern states and then throughout the country, when tomatoes began to be used regularly as food. In some regions this may have happened quite quickly; for example, in an 1824 speech before the Albemarle Agricultural Society, Jefferson's son-in-law Thomas Mann Randolph discussed the transformation of Virginia farming due to the introduction of new crops. He mentioned how tomatoes were virtually unknown ten years earlier, but by 1824 everyone was eating them because it was believed they kept one's blood pure in the heat of summer. An increase in immigration during the 19th century also increased tomato consumption in North America. The first settlers in North America immigrated before tomatoes were popular, but by the 19th century, virtually all of Europe consumed tomatoes. These 19th century immigrants consumed American tomatoes, and gradually more established Americans followed suit. As Randolph's speech shows, medicinal powers were sometimes attributed to tomatoes. The idea that tomatoes could be used as a curative was fully developed by Dr. John Cook Bennett, who believed that tomatoes could treat diarrhea, dyspepsia, and other stomach ailments. Bennett's claims were widely publicized in the 1830s, in part because they were fun to mock, and in part because the tomato was still a novelty. Soon tomato pills were being sold, and people began to testify to miracle cures caused by the healing powers of tomatoes. They were even recommended as a cure for cholera (since tomatoes are a healthy food, they may have actually been a better alternative than other decidedly harmful medical practices of the day). It is possible that it really did "cure" ailments which were due to shortages of fresh fruit in the diet. The tomato mania lasted only a few years, but it enormously boosted tomato consumption and contributed to an increase in tomato sales throughout the 1830s and 1840s. By the end of this period, tomatoes were an established part of the American diet. Tomatoes in France The tomato was introduced to France through Provence from Italy during the late 18th century and became a culinary symbol of the French Revolution due to its red color. They are widely eaten in French cuisine. France is home to the 'Carolina', a rare, indeterminate, open-pollinated cultivar of tomato which possesses the tanginess of 'Brandywine' and the stature and externalities of the Early Swedish, that is, IPB. First noted by Italian monk Giacomo Tiramisunelli and his companion Andrea di Milininese somewhere near Bordeaux, more modern researches such as Dragos Niculae et al. and Nicolas Dela Nisan claim Belgium as the birthplace of the cultivar. Either way, the 'Carolina' is considered a rare delicacy amongst tomato-connoisseurs throughout France and beyond; it is the only cultivar of tomato traditionally served with Ortolan (fig-fed songbird). Claims that a San Diego-based U.S. biotech company is trying to genetically modify 'Carolina' to extend its potential geographic growth range has set off a minor furor in Bordeaux, with the president of a Belgian agro-commune, Victor DePlata, threatening extreme action . Cultivation and uses
Growing needs For information on growing tomatoes, please see the relevant chapter in A Wikimanual of Gardening, and/or WikiHow: to Grow a Tomato Plant Cultivars
Diseases and pests Tomato cultivars vary widely in their resistance to disease. Modern hybrids focus on improving disease resistance over the heirloom plants. One common tomato disease is tobacco mosaic virus, and for this reason smoking or use of tobacco products should be avoided around tomatoes. Various forms of mildew and blight are also common tomato afflictions, which is why tomato cultivars are usually marked with letters like VFN, which refers to disease resistance to verticillium wilt, fusarium fungus, and nematodes. Some common tomato pests are cutworms, tomato hornworms, aphids, cabbage loopers, whiteflies, tomato fruitworms, flea beetles, slugs, and Colorado potato beetles. Pollination In the wild, original state, tomatoes required cross-pollination; they were much more self-incompatible than domestic cultivars. As a floral device to reduce selfing, the pistils of wild tomatoes extended farther out of the flower than today's cultivars. The stamens were, and remain, entirely within the closed corolla. As tomatoes were moved from their native areas, their traditional pollinators, (probably a species of halictid bee) did not move with them. The trait of self-fertility (or self-pollenizing) became an advantage and domestic cultivars of tomato have been selected to maximize this trait. This is not the same as self-pollination, despite the common claim that tomatoes do so. That tomatoes pollinate themselves poorly without outside aid is clearly shown in greenhouse situations where pollination must be aided by artificial wind, vibration of the plants (one brand of vibrator is a wand called an "electric bee" that is used manually), or more often today, by cultured bumblebees. The anther of a tomato flower is shaped like a hollow tube, with the pollen produced within the structure rather than on the surface, as with most species. The pollen moves through pores in the anther, but very little pollen is shed without some kind of outside motion. The best source of outside motion is a sonicating bee such as a bumblebee or the original wild halictid pollinator. In an outside setting, wind or biological agents provide sufficient motion to produce commercially viable crops. Hydroponic and greenhouse cultivation Tomatoes are often grown in greenhouses in cooler climates, and indeed there are cultivars such as the British 'Moneymaker' and a number of cultivars grown in Siberia that are specifically bred for indoor growing. In more temperate climates, it is not uncommon to start seeds for future transplant in greenhouses during the late winter as well. Hydroponic tomatoes are also available, and the technique is often used in hostile growing environments as well as high-density plantings. Picking and ripening Tomatoes are often picked unripe (and thus green) and ripened in storage with ethylene. Ethylene is a hydrocarbon gas produced by many fruits that act as the cue to begin the ripening process. Tomatoes ripened in this way tend to keep longer but have poorer flavor and a mealier, starchier texture than tomatoes ripened on the plant. They may be recognized by their color, which is more pink or orange than the other ripe tomatoes' deep red. In 1994 Calgene introduced a genetically modified tomato called the 'FlavrSavr' which could be vine ripened without compromising shelf life. However, the product was not commercially successful (see main article for details) and was only sold until 1997. Recently, stores have begun selling "tomatoes on the vine", which are determinate varieties that are ripened or harvested with the fruits still connected to a piece of vine. These tend to have more flavor than artificially ripened tomatoes (at a price premium), but still may not be the equal of local garden produce. Slow-ripening cultivars of tomato have been developed by crossing a non-ripening cultivar with ordinary tomato cultivars. Cultivars were selected whose fruits have a long shelf life and at least reasonable flavor. These have been nicknamed "Thrushworthy Bumbletots", as this is the name of the machine system used to clean the tomatoes before processing to be canned or shipped. The name is an example of onomatopoeia. Modern uses of tomatoes
Storage Most tomatoes today are picked before fully ripe. They are bred to continue ripening, but the enzyme that ripens tomatoes stops working when it reaches temperatures below 12.5 °C. Once an unripe tomato drops below that temperature, it will not continue to ripen. Once fully ripe, tomatoes can be stored in the refrigerator but are best eaten at room temperature. Tomato legends There are many legends about the tomato. For example, it has been claimed that tomatoes were not widely eaten in the U.S until the late 1800s. It has sometimes been claimed that tomatoes were considered aphrodisiacs and so were shunned by the Puritans. Other claims center on the supposed fear that tomatoes were poisonous, based on the fact that they belong to the Solanales Order, or "Nightshade" family, which contains many toxic plants. Many legends also maintain that the tomato was introduced into the U.S. from South America by one particular person; Thomas Jefferson is sometimes mentioned. Tomatoes' status as an aphrodisiac may be due to a mistranslation. Legend has it a Frenchman on his travels ate a meal with tomatoes in it and was fascinated with the new taste. He went back to the chef who was Italian and asked him what this new ingredient was. The chef said "Pomme de' Moors" (Apple of the Moors), but the Frenchman misunderstood and thought he said "Pomme d'Amore" (Apple of Love). The most famous legend of this sort was introduced by Joseph S. Sickler in the mid-1900s, and became the subject of a CBS broadcast of You Are There in 1949. The story goes that the lingering doubts about the safety of the tomato in the United States were largely put to rest in 1820, when Colonel Robert Gibbon Johnson announced that at noon on September 26, he would eat a basket of tomatoes in front of the Salem, New Jersey, courthouse. Reportedly, a crowd of more than 2,000 persons gathered in front of the courthouse to watch the poor man die after eating the poisonous fruits, and were shocked when he lived. In his book Smith notes that there is little, if any, historical evidence for any of these legends, and that they continue to be repeated largely because they are entertaining stories. It is also said that the tomato became popular in France during the French Revolution, because the revolutionaries' iconic color was red; and at one point it was suggested that they should eat red food as a show of loyalty. Since European royalty was still leery of the nightshade-related tomato, it apparently was the perfect choice. This may also be why the first reported use of the tomato in the U.S. was in New Orleans, Louisiana, in 1812, because of the French influence in that region. There is also a story which claims that an agent for Britain attempted to kill General George Washington by feeding him a dish laced with tomatoes during the American Revolution. Botanical classification In 1753 the tomato was placed in the genus Solanum by Linnaeus as Solanum lycopersicum L. (derivation, 'lyco', wolf, plus 'persicum', peach, i.e., "wolf-peach"). However, in 1768 Philip Miller placed it in its own genus, and he named it Lycopersicon esculentum. This name came into wide use but was in breach of the plant naming rules. Technically, the combination Lycopersicon lycopersicum (L.) H.Karst. would be correct, but this name (published in 1881) has hardly ever been used. Therefore, it was decided to conserve the well-known Lycopersicon esculentum, making this the correct name for the tomato when it is placed in the genus Lycopersicon. However, genetic evidence (e.g., Peralta & Spooner 2001) has now shown that Linnaeus was correct in the placement of the tomato in the genus Solanum, making the Linnaean name correct; if Lycopersicon is excluded from Solanum, Solanum is left as a paraphyletic taxon. Despite this, it is likely that the exact taxonomic placement of the tomato will be controversial for some time to come, with both names found in the literature. A genome project for the tomato was begun in 2004, with a draft version of the full genome expected to be published by 2008. The genomes of its organelles (mitochondria and chloroplast) are also expected to be published as part of the project. Fruit or vegetable? Botanically speaking, a tomato is the ovary, together with its seeds, of a flowering plant, that is a fruit or, more precisely, a berry. However, from a culinary perspective, the tomato is not as sweet as those foodstuffs usually called fruits and it is typically served as part of a main course of a meal, as are other vegetables, rather than at dessert. As noted above, the term "vegetable" has no botanical meaning and is purely a culinary term. This argument has led to actual legal implications in the United States, Australia and China. In 1887, U.S. tariff laws that imposed a duty on vegetables but not on fruits caused the tomato's status to become a matter of legal importance. The U.S. Supreme Court settled this controversy in 1893, declaring that the tomato is a vegetable, using the popular definition which classifies vegetable by use, that they are generally served with dinner and not dessert. The case is known as Nix v. Hedden (149 U.S. 304). While the Tomato can be classified as a fruit, it is officially categorized as a definite vegetable in the United States. The USDA also considers the tomato a vegetable. Strictly speaking, the holding of the case applies only to the interpretation of the Tariff Act of March 3, 1883, and not much else. The court does not purport to reclassify tomato for botanical or for any other purpose other than paying a tax under a tariff act. In concordance with this classification, the tomato has been proposed as the state fruit of New Jersey. Arkansas takes both sides by declaring the "South Arkansas Vine Ripe Pink Tomato" to be both the state fruit and the state vegetable in the same law, citing both its botanical and culinary classifications. But due to the scientific definition of a fruit and a vegetable, the tomato still remains a fruit when not dealing with tariffs. Nor is it the only culinary vegetable that is a botanical fruit: eggplants, cucumbers, and squashes of all kinds (including zucchini and pumpkins) share the same ambiguity. Pronunciation The pronunciation of tomato differs in different English-speaking countries; the two most common variants are and . Speakers from the British Isles, most of the Commonwealth, and older generations among speakers of Southern American English typically say , while most American and Canadian speakers usually say . Most or all languages apart from English have a word that corresponds more to the former pronunciation, including the original Nahuatl word whence they are all taken. The word's dual pronunciations were immortalized in Ira and George Gershwin's 1937 song "Let's Call the Whole Thing Off" (You like and I like / You like and I like ) and have become a symbol for nitpicking pronunciation disputes. In this capacity it has even become an American slang term: saying when presented with two choices can mean "Why should I care? There's no real difference." Safety On October 30, 2006 the US Center for Disease Control and Prevention (CDC) announced that tomatoes might be the source of an salmonella outbreak causing 172 illnesses in 18 states.* The affected states include: Arkansas, Connecticut, Georgia, Indiana, Kentucky, Maine, Massachusetts, Michigan, Minnesota, North Carolina, New Hampshire, Ohio, Pennsylvania, Rhode Island, Tennessee, Virginia, Vermont and Wisconsin. Tomatoes have been linked to 7 salmonella outbreaks since 1990(from the Food Safety Network).* Tomato records The heaviest tomato ever was one of 3.51 kg (7 lb 12 oz), of the cultivar 'Delicious', grown by Gordon Graham of Edmond, Oklahoma, in 1986. The largest tomato plant grown was of the cultivar 'Sungold' and reached 19.8 m (65 ft) length, grown by Nutriculture Ltd (UK) of Mawdesley, Lancashire, UK, in 2000. See also Notes | |||||||||||||||||||||||||||||||||||||||||
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